CVE-2022-49548 Information

Description

In the Linux kernel the following vulnerability has been resolved:

bpf: Fix potential array overflow in bpf_trampoline_get_progs()

The cnt value in the ‘cnt >= BPF_MAX_TRAMP_PROGS’ check does not include BPF_TRAMP_MODIFY_RETURN bpf programs so the number of the attached BPF_TRAMP_MODIFY_RETURN bpf programs in a trampoline can exceed BPF_MAX_TRAMP_PROGS.

When this happens the assignment ‘progs++ = aux->prog’ in bpf_trampoline_get_progs() will cause progs array overflow as the progs field in the bpf_tramp_progs struct can only hold at most BPF_MAX_TRAMP_PROGS bpf programs.

Reference

https://git.kernel.org/stable/c/32c4559c61652f24c9fdd5440342196fe37453bc https://git.kernel.org/stable/c/4f8897bcc20b9ae44758e0572538d741ab66f0dc https://git.kernel.org/stable/c/7f845de2863334bed4f362e95853f5e7bc323737 https://git.kernel.org/stable/c/a2aa95b71c9bbec793b5c5fa50f0a80d882b3e8d https://git.kernel.org/stable/c/e36452d5da6325df7c10cffc60a9e68d21e2606d